#749 – Handling the TouchEnter and TouchLeave Events

When handling the raw touch events, if you touch a user interface element and then lift your finger off the element, you’ll see the events:

• TouchDown
• TouchUp

These two events do not capture, however, cases when you slide your finger onto or off of the element.  For this situation, you can  handle the TouchEnter and TouchLeave events, which fire when a touch contact enters or leaves the boundaries of the element.

If you then touch an element and then lift your finger off the element, you’ll see:

• TouchEnter
  
• TouchDown
• TouchUp
• TouchLeave

If you slide your finger onto the element and then lift your finger off the element, you’ll see:

• TouchEnter
• TouchUp
• TouchLeave

Touching an element and then sliding off it leads to:

• TouchEnter
• TouchDown
• TouchLeave

Finally, sliding onto and then off an element leads to:

• TouchEnter
• TouchLeave